JP3363554B2 - Construction method of concrete building - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete block generated when a building such as a concrete building or a bridge is demolished, which is erected on a sloping ground to prevent it from collapsing or to flatten the ground. The present invention relates to a method for constructing a concrete structure, which is processed by filling a space between semi-precast concrete plates with a part of the reinforcing bar exposed on the back when constructing a structure such as a retaining wall for construction.

[0002]

2. Description of the Related Art In recent years, in order to reach the end of its useful life or to become old and modern, buildings such as reinforced concrete and bridges are often destroyed and rebuilt. Most of the concrete lumps that were generated as a result were dumped at industrial waste treatment plants.

[0003]

The industrial waste treatment plant in which such a lump of concrete is dumped is caused by a dump truck carrying the lump or because of pollution caused by dumping of other harmful industrial waste. Meet the opposition of local residents and limit transportation costs to this industrial waste disposal site because it is limited to mountainous areas away from the city.

Further, even if a new building is to be constructed at the place where this concrete lump has been dumped, the discarded concrete lump must be removed for the foundation work, which is difficult to remove. Made it impossible to use concrete lumps for landfill work, but on the other hand, the number of buildings that are being destroyed is increasing, making it impossible to completely dispose of them.

The present invention, in order to solve the above-mentioned problems in the conventional treatment of destructive lumps of concrete structures, is required for the construction of structures such as retaining walls, for which there is an increasing need in recent years. An object of the present invention is to provide a method for constructing a concrete structure that treats lumps and solves various problems such as an increase in the cost of dumping concrete-damaged lumps and the occurrence of pollution and illegal dumping.

[0006]

The method for constructing a concrete structure according to the present invention is intended to achieve the above-mentioned object, and the means for constructing a concrete structure is to expose a part of the reinforcing bar to the back side and bury it in concrete. In addition, a semi-precast concrete board with structural rebars embedded in the base concrete at the bottom and the semi-precast concrete board
Sheets, joining rebars that are joined by welding or the like with their rear sides facing each other through an appropriate interval, and a standing means that is provided at the bottom of the semi-precast concrete plate and that erects the joined semi-precast concrete plate. Using the concrete retaining wall formwork provided, by embedding the structural rebar in the foundation concrete together with the lower part of the concrete retaining wall formwork in a state of standing upright in a horizontal state by the standing means, and for the concrete retaining wall It is characterized in that a crushed mass such as a concrete structure is filled in a space of a mold and then a cement mixture such as cement milk or mortar is poured and solidified.

The upright means is provided with fasteners such as nuts and bolts attached to the lower portion of the connected semi-precast concrete plates, and the upright metal fittings for horizontally installing the concrete retaining wall formwork are provided by the fasteners. It is characterized in that it is detachably attached and surrounds the upright metal fittings that are erected by a shielding wall, and the lower part of the semi-precast concrete plate is filled with basic concrete excluding this upright metal fitting, and then the upright metal fittings are removed. It is a thing.

The standing means is formed by fixing standing metal fittings for horizontally installing the semi-precast concrete boards under the connected semi-precast concrete boards. The standing metal fittings are embedded in the foundation concrete. Alternatively, the standing means may be formed as a protrusion on the lower surface of the semi-precast concrete plate, and the protrusion may be embedded in the basic concrete.

[0009]

According to the method for constructing a concrete structure according to claim 1 of the present invention, when a wall surface of a concrete structure such as a retaining wall having a relatively large thickness is constructed, the structure is used in a factory for producing a precast concrete plate. The wall surface of
The back of two semi-precast concrete plates with exposed reinforcing bars on the back are connected by welding with a joining rebar, and after they are transported to the construction site, they are integrated by the standing metal fittings at the bottom of the semi-precast concrete plates. Stand up the semi-precast concrete board that is being used.

Then, the structural rebar is embedded in the basic concrete, and a crushed mass such as a concrete structure is packed between two semi-precast concrete plates, and then a cement mixture such as cement milk or mortar is poured and solidified. In addition to treating the lumps of destruction that occur when concrete structures are destroyed, the reinforcing bars that are embedded in the semi-precast concrete plate and exposed on the back side are embedded in the cement mixture, and these are integrated to make a strong construction. The wall surface of the object is formed.

According to a second aspect of the present invention, there is provided a method for constructing a concrete structure, wherein the standing metal fitting for raising the integrated semi-precast concrete plate is made by screwing a fastener such as a bolt and a nut. The retaining wall can be installed and removed at the installation site.

Further, in the method for constructing a concrete structure according to claim 3, the standing metal fittings are integrally provided in advance on the semi-precast concrete board.
In the method for constructing a concrete structure according to claim 4, it is possible to eliminate the trouble of attaching and detaching the upright metal fittings on the construction site, and by making the upright metal fittings also serve as the protrusions provided on the lower surface of the semi-precast concrete board, It eliminates the need to configure the metal fittings separately.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment in which the present invention is applied to a retaining wall constructed on a slope or the like will be described below with reference to FIGS. In this embodiment, the place where the retaining wall is constructed is dug down as in the conventional case, and the split A and the discarded concrete B are performed.

Also, a semi-precast concrete board 1
What is called an omnier plate is used as 1, and the reinforcing bars of this semi-precast concrete plate 11 are fixed in combination with the reinforcing bars 11a, which are fixed in combination in the vertical and horizontal directions, and are raised from the reinforcing bars 11a. The saw-toothed reinforcing bar 11b is provided, and the back reinforcing bar 11c is vertically and horizontally combined and fixed on the saw-toothed reinforcing bar 11b.

This rebar is assembled on a formwork into which concrete 15 for forming the semi-precast concrete plate 11 is poured, and the joining rebar 12 is joined to the rebar 11a in an upward direction perpendicular to the plane of the rebar 11a. Although fixed, the joint reinforcing bar 12 may be omitted when another joint reinforcing bar is welded to the serrated reinforcing bar 11b as described later.

Further, at a predetermined position on the lower side of the semi-precast concrete plate 11 of the formwork when standing up,
The nuts 13 are arranged in two sets on the left and right, but the mounting bolts may be embedded so that the nuts 13 project below the mold instead of the nuts 13.

A plurality of structural rebars 14 bent in a substantially right angle, that is, the semi-precast concrete plate 11 completed as a retaining wall, is required below the formwork in order to maintain strength so as not to collapse. It is fixed to the rebar 11a on the lower side such that the number of bent portions is exposed to the outside from the lower side.

Then, the concrete 15 is prevented from flowing into the screw hole of the nut 13, and the sawtooth-shaped reinforcing bar 11b is provided.
The concrete 15 is poured onto the mold to the extent that about half of the above and the reinforcing bars 11a are buried, and the mold is removed after solidification of the mold to form the semi-precast concrete plate 11.

Therefore, the surface of the nut 13 is exposed and embedded in the lower surface of the semi-precast concrete plate 11, and about half of the serrated reinforcing bars 11b and the rear reinforcing bar 11c are exposed on the rear surface side. Further, the joint reinforcing bar 12 is erected on the back surface, and the structural reinforcing bar 14 is buried further below so as to expose its bent portion.

The two semi-precast concrete plates 11 formed in this way are arranged such that the exposed rear side of the serrated rebar 11b is wide so that the exposed lower side of the structural rebar 14 is wide and the opposite upper side is narrow. The two semi-precast concrete plates 11 are integrated by facing each other at predetermined intervals and welding the joining reinforcing bars 12 to each other to form a concrete retaining wall formwork.

As described above, in the case where the semi-precast concrete plate 11 is integrated by welding both ends of another joining rebar different from the joining rebar 12 to the serrated rebar 11b, the joining rebar 12 is joined to the semi-precast concrete. It is not necessary to bury it in 11.

The formwork for the concrete retaining wall is to be transported to the installation site of the concrete retaining wall. At this installation site, the upright metal fitting 16 is screwed into the nut 13 by the bolt 20 so that the lower part of the semi-precast concrete board 11 is lowered. Attached to. However, when the mounting bolts are embedded in the semi-precast concrete plate 11, they are similarly mounted by screwing a nut.

The upright metal fitting 16 is constructed by welding a short square tubular mounting portion 16b and a long square tubular mounting portion 16a with their upper ends aligned and welded to each other, and the mounting portion 16b and the mounting portion 16a are penetrated. A hole is bored, and the attachment portion 16b is attached to the semi-precast concrete plate 11 by screwing the bolt 20 with the head inserted through the through hole into the nut 13.

In addition, the upright fitting 16 includes a mounting portion 16
A female screw 17a that is screwed into the bolt leg 17 is attached to the lower end of a, and the length of the bolt leg 17 protruding from the female screw 17a can be changed by the rotation of the bolt leg 17.

In this way, the formwork for the concrete retaining wall of the two integrated semi-precast concrete plates 11 to which the uprights 16 are attached is placed on the waste concrete B for constructing the retaining wall. , It stands up to form a predetermined taper. The right and left inclinations at the time of standing are adjusted by the bolt legs 17 of the two left and right standing metal fittings 16, and the taper in the front-rear direction is adjusted by the bolt legs 17 of either of the semi-precast concrete plates 11.

Next, the semi-precast concrete plate 11 is erected on the concrete B by surrounding the upright metal fittings 16 standing upright and surrounding the upright metal fittings 16 to prevent concrete from flowing inside. Circulate. After that, the basic concrete C is poured onto the discarded concrete B to a height at which the lowermost part of the semi-precast concrete plate 11 is buried.

Therefore, the structural rebar 14 is embedded in the basic concrete C, and plays a role of supporting the semi-precast concrete plate 11 after removing the upright 16 and integrating the basic concrete C.

After the solidification of the basic concrete C is awaited, the shielding wall 18 is removed, and the mounting bolts 20 screwed into the nuts 13 are removed to remove the uprights 16 from the semi-precast concrete plate 11. In this case, as described above, the semi-precast concrete plate 11 is embedded in the base concrete C at the lowermost part thereof and is supported by the structural rebars 14 embedded in the base concrete C. There is no fear of collapse.

Concrete 19 is poured into a hollow portion formed by the shielding wall 18 generated after the removal of the upright 16 to close the hollow, and the upright metal fitting 16 can be reused at another place by removing it. .

Further, between the front side and the back side of the semi-precast concrete plate 11, a crushed concrete lump produced when a concrete structure or the like is demolished is packed, and then a concrete mixture D such as cement milk or mortar is poured. Then, the concrete mixture D is solidified. As a result, the two semi-precast cochleate plates 11 are integrated.

The construction work of the retaining wall is completed by arranging the countersunk stones on the inner surface side of the concrete retaining wall thus installed and performing a predetermined construction such as embedding soil. Therefore, since the semi-precast concrete plate is formed and the two semi-precast concrete plates are connected at the factory, the work on the construction site is reduced, the construction period is shortened and the dimensions of the concrete retaining wall are accurate. Can be achieved.

Then, compared to the conventional precast concrete retaining wall that carried the entire concrete retaining wall,
Since the weight of the concrete retaining wall form made up of two semi-precast concrete plates 11 can be reduced, the transport weight can be reduced, and in the case of transporting the same weight, it is possible to transport a retaining wall with a long span, Together with the fact that the upright metal fitting 16 can be reused, the construction cost can be reduced.

Further, since the semi-precast concrete plate is used as the form, it does not deform like the conventional veneer form or steel form when packing the concrete breaking slab, and the semi-precast concrete plate is used. Reinforcing bars are laid inside the precast concrete, so there is no reinforced steel to fold and break the reinforcing bars when packing the breaking holes, so it is easy to pack the breaking holes. Is something that can be done.

Next, a second embodiment of the present invention will be described below. In this embodiment, before the semi-precast concrete plate 11 in the previous embodiment is integrated by welding the joining rebar 12, the same standing metal fitting 16 as in the first embodiment is used.
Is fixed to and attached to the semi-precast concrete plate 11. Then, the standing metal fitting 16 is embedded in the basic concrete C to be driven at the construction site so as not to be removed. The mounting and removal of the standing metal fitting 16 on the site, the formation of the shielding wall 18, and the formation thereof. This eliminates the trouble of filling the cavity.

Further, a third embodiment of the present invention will be described below with reference to FIG. In this embodiment, the mold for pouring the concrete 15 forming the semi-precast concrete plate 11 in the previous embodiment is provided with a portion where the protrusion 21 as shown in FIG. 4 is formed, but the nut 13 is embedded. The construction of the semi-precast concrete plate 11 is the same as that of the previous embodiment except that it is not performed.

A nut 22 is preliminarily attached to the portion forming the projecting portion 21 in such a manner that concrete does not flow into the screw hole, and then concrete 15 is poured in the same manner as in the previous embodiment, and the nut is put on the lower surface. The protrusion 21 in which the nut 22 is embedded is formed.

The semi-precast concrete plates 11 thus formed are connected by joining the two reinforcing bars 12 to each other by facing each other with their backs facing each other at appropriate intervals as in the previous embodiment. And nut 22
The adjusting bolt 23 is screwed into the screw.

This connected semi-precast concrete plate 11 is transported to the construction site of the concrete retaining wall in the same manner as in the previous embodiment and is erected on the concrete B to be discarded. The taper is performed by rotating the adjusting bolt 23, which is the same as the previous embodiment.

In this case, the adjusting bolt 23 is attached to the protrusion 21.
Instead of screwing in, a block having an adjusting screw that can be expanded and contracted in the vertical direction may be interposed below the protruding portion 21, and the adjustment screw may be rotated to level out left and right and adjust the front and rear taper.

Then, the shielding wall 18 in the second embodiment.
Without preventing the concrete concrete C from flowing into the projecting portion 21, the structural rebar 14, and the upright metal fittings 16.
The basic concrete C is poured to such an extent that the and are completely buried. Therefore, it is necessary to attach and detach the standing metal fitting 16 of the previous embodiment, remove the shielding wall 18, and pour the concrete 19 into the removal mark. It can be omitted.

[0041]

As described above, the present invention can be applied to the construction of a concrete wall having a relatively large thickness, such as a retaining wall.
Since it is possible to treat a concrete block that has destroyed a concrete structure or the like, and the amount of new concrete used can be reduced by the amount of this concrete block, it is possible to reduce material costs.

The transportation of concrete lumps will be different from transportation to a remote industrial waste treatment plant in the mountainous area, and the transportation cost will not be a special expense and no pollution will occur. Therefore, it becomes a useful industrial waste treatment method.

Furthermore, not only the semi-precast concrete plates on the front and rear sides of the concrete structure and the destroyed lumps of the concrete structure are integrated with the concrete filled between them to form a strong structure, but also the semi-precast concrete plate. Since it is integrated with a reinforcing bar for joining, it has an effect that there is no risk of collapse when filling concrete lumps or concrete.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a main part of a first embodiment of the present invention.

FIG. 2 is a plan view of the above.

FIG. 3 is a vertical sectional view of the entire same as above.

FIG. 4 is a front view of a third embodiment of the present invention.

[Explanation of symbols]

C foundation concrete D Concrete destroyed lump mixture 11 Semi-precast concrete board 11a Reinforcing bar 11b Serrated rebar 11c Back reinforcement 12 joint rebar 13 nuts 14 Structural rebar 16 Standing metal fittings 20 mounting bolts 21 Projection 23 Adjustment bolt

Continuation of front page (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 29/02 309

Claims (4)

(57) [Claims] 1. A semi-precast concrete plate in which a part of a reinforcing bar is exposed to the back side and embedded in concrete, and a structural reinforcing bar embedded in a basic concrete is embedded in a lower part, and the semi-precast concrete plate is 2
Sheets, joining rebars that are joined by welding or the like with their rear sides facing each other through an appropriate interval, and a standing means that is provided at the bottom of the semi-precast concrete plate and that erects the joined semi-precast concrete plate. Using the concrete retaining wall formwork provided, by embedding the structural rebar in the foundation concrete together with the lower part of the concrete retaining wall formwork in a state of standing upright in a horizontal state by the standing means, and for the concrete retaining wall A method for constructing a concrete structure, characterized in that a destructive lump of a concrete structure or the like is filled in a space between molds, and then a cement mixture such as cement milk or mortar is poured and solidified. 2. The upright means comprises a fastener such as a nut or a bolt attached to a lower portion of the connected semi-precast concrete boards, and the upright means for horizontally installing the concrete retaining wall formwork by the fastener. The metal fittings are detachably attached, the surroundings of the standing metal fittings are surrounded by a shielding wall, the lower part of the semi-precast concrete plate is filled with basic concrete excluding the portion of the metal fittings, and then the metal fittings are removed. The method for constructing a concrete building according to claim 1. 3. The standing means is formed by fixing standing metal fittings for horizontally installing the semi-precast concrete boards under the connected semi-precast concrete boards. 2. The method for constructing a concrete structure according to claim 1, wherein the concrete structure is buried. 4. The construction of a concrete building according to claim 3, wherein the standing means is formed as a projecting portion on the lower surface of the semi-precast concrete plate, and the projecting portion is embedded in the basic concrete. Method.